Year	kg per 2011 PPP $ of GDP
1992	1.14813066526442
1993	1.09119981991962
1994	1.04724605224971
1995	1.09185196261111
1996	1.05147432501516
1997	0.934323019281008
1998	0.840852594213066
1999	0.785385171083749
2000	0.711573422879599
2001	0.666496094308476
2002	0.630207123077837
2003	0.601388327134354
2004	0.586253901785527
2005	0.545172831607824
2006	0.519939203640791
2007	0.46682945211245
2008	0.441689180821347
2009	0.427641504657701
2010	0.408515039470883
2011	0.393932384510189
2012	0.382318415898091
2013	0.381791319770965
2014	0.37371491811297